A technical guide to twilio migration covering the exact steps to move from Twilio Programmable Voice to Teler’s WebSocket-based voice infrastructure. Covers audio format requirements, bidirectional media stream setup, barge-in handling, and the specific engineering decisions that determine whether the migration succeeds in production.
Migrating from Twilio Programmable Voice to Teler Read More »
A technical checklist for backend and API engineers shipping voice agents to production in 2026. Covers audio format requirements, WebSocket session handling, barge-in mechanics, failure modes including the 8 kHz resampling trap, and what Teler’s programmable voice infrastructure handles versus what your team must build.
Voice Agent Production Readiness Checklist Read More »
A practical guide to connecting the Gemini Live API to live phone calls in 2026. Covers the WebSocket transport, the 16 kHz PCM input and 24 kHz PCM output format mismatch with PSTN audio, session limits, failure modes, and where a telephony layer like Teler fits in the architecture.
Gemini Live API for Voice Agents on the Phone Read More »
Connecting the ElevenLabs API to a live phone call requires bridging two incompatible audio worlds: ElevenLabs streams PCM at 24 kHz or higher over WebSocket, while PSTN carriers expect 8 kHz narrowband audio. This guide walks backend engineers through the architecture, format conversion, and failure modes that matter in production in 2026.
ElevenLabs API on a Live Phone Call Read More »
The OpenAI Agents SDK connects to the Realtime API over WebSocket using pcm16 audio, but it ships with no carrier connectivity, no phone number provisioning, and no PSTN bridge. This guide walks backend engineers through the full audio path from carrier to model, the resampling requirement, and the transport decision that determines your latency budget in 2026.
OpenAI Agents SDK: Adding Real Phone Calls Read More »
Putting Ultravox AI on a live phone line requires bridging a real-time voice model to PSTN infrastructure that was never designed for it. This guide covers the audio path, WebSocket transport constraints, telephony integration patterns, and the specific failure modes developers hit when connecting Ultravox to carrier networks in 2026.
Ultravox AI: Putting It on a Phone Line Read More »
Twilio Media Streams forks live call audio over a secure WebSocket connection, delivering raw μ-law audio at 8 kHz for real-time processing by your server. This guide covers the full protocol, audio format requirements, documented failure modes, and how alternatives like Teler compare for AI voice agent workloads in 2026.
Twilio Media Streams: How They Work and the Alternatives Read More »
A practical Voice AI glossary covering 40 terms developers encounter when building real-time phone agents: STT, TTS, VAD, barge-in, SIP trunking, WebSocket media streaming, DTMF, and more. Each definition includes the engineering context you need to make architecture decisions, not just dictionary entries.
Voice AI Glossary: 40 Terms Developers Actually Use Read More »
A practical guide to implementing a call recording API over telephony infrastructure in 2026. Covers Twilio’s Recording resource, TwiML verb choices, dual-channel audio, status callback failures, compliance considerations, and how Teler’s WebSocket transport fits into a recording-enabled voice pipeline.
Call Recording API: Implementation and Compliance Read More »
Voice activity detection (VAD) determines when a speaker starts and stops talking inside a live audio stream. This guide covers how VAD works in telephony pipelines, the difference between server_vad and semantic_vad modes, the audio format constraints developers must handle, and how Teler’s WebSocket transport connects carrier audio to AI models.
Voice Activity Detection in Telephony Read More »
